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检索条件"任意字段=Proceedings of the 1997 Conference on Advances in Parallel and Distributed Computing"

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parallel o(log2 iv) algorithm for the motion simulation of general multi-rigidbody mechanical systems

Parallel o(log2 iv) algorithm for the motion simulation of g...

引用

ASME 1997 Design Engineering Technical conferences, DETC 1997

作者： Anderson, Kurt S. Department of Mechanical Engineering Aeronautical Engineering and Mechanics Rensselaer Polytechnic Institute Troy New York12180-3590 United States

ISBN: (纸本)9780791880401

This paper presents a new highly efficient procedure for the determination of the dynamical equations of motion for complex multibody systems and their subsequent temporal integration using parallel computing. The method is applicable to general systems of rigid bodies which may contain arbitrary joint types, multiple branches, and/or close loops. The method is based on the explicit determination of constraint forces at key joint locations and the subsequent highly efficient determination of system state time derivatives. The algorithm uses a novel hybrid direct and iterative solution scheme which allows a substantially higher degree of parallelization than is generally obtainable using the more conventional recursive O(N) procedures. It is shown that at the coarsest level the parallelization obtainable easily exceeds that indicated by the topology of the system. The procedure can produce a theoretical and time optimal O(log, N) performance on computational hroughput with a processor optimal O(N) processors on a MIMD distributed architecture processing system. © 1997 by ASME.

关键词： Iterative methods

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Solving sparse least squares problems on massively distributed memory computers

Solving sparse least squares problems on massively distribut...

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proceedings of the advances in parallel and distributed computing

作者： Tianruo Yang Department of Computer science Linköping University Sweden

ISBN: (纸本)0818678763

In this paper we study the parallel aspects of PCGLS, a basic iterative method whose main idea is to organize the computation of conjugate gradient method with preconditioner applied to normal equations, and incomplete modified Gram-Schmidt (IMGS) preconditioner for solving sparse least squares problems on massively parallel distributed memory computers. The performance of these methods on this kind of architecture is always limited because of the global communication required for the inner products. We describe the parallelization of PCGLS and IMGS preconditioner by two ways of improvement. One is to assemble the results of a number of inner products collectively and the other is to create situations when communication can be overlapped with computation. A theoretical model of computation and communication phases is presented which allows us to decide the number of processors that minimizes the runtime. Several numerical experiments on Parsytec GC/PowerPlus are presented.

关键词： Least squares methods Concurrent computing distributed computing Iterative methods Gradient methods Equations Computer architecture Global communication Assembly Computational modeling

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Study and design of scalable memory-shared multiprocessing system

Study and design of scalable memory-shared multiprocessing s...

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proceedings of the advances in parallel and distributed computing

作者： Chengqing Ye Zhonghai Wu Changsheng Yang Department of Computer Sciences and Technology Zhejiang University Hangzhou China

ISBN: (纸本)0818678763

This paper proposes the design of a scalable memory-shared multiprocessing system SMMP which supports Client/Server mode. SMMP system is composed of two-level interconnection networks, three-level memory subsystem and three-level I/O subsystem. There are many advantages in the design of our SMMP, such as scalable, easy to implement and operate, general purpose and large I/O throughput. It can be an excellent server for high-speed communication network.

关键词： Multiprocessing systems File servers Network servers Sun Workstations Throughput Process design Multiprocessor interconnection networks Microcomputers Concurrent computing

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Language support for synchronous parallel critical sections

Language support for synchronous parallel critical sections

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proceedings of the advances in parallel and distributed computing

作者： C.W. Kessler H. Seidl Facbereich IV-Inf. Trier Univ. Germany Fachbereich IV-Informatik Universität Trier Trier Germany

We introduce a new parallel programming paradigm, namely synchronous parallel critical sections. Such parallel critical sections must be seen in the context of switching between synchronous and asynchronous modes of computation. Thread farming allows to generate bunches of threads to solve independent subproblems asynchronously and in parallel. Opposed to that, synchronous parallel critical sections allow to organize bunches of asynchronous parallel threads to execute certain task jointly and synchronously. We show how the PRAM language Fork95 can be extended by a construct join supporting parallel critical sections. We explain its semantics and implementation, and discuss possible applications.

关键词： Yarn parallel programming Databases Concurrent computing Phase change random access memory Resource management Frequency Personal communication networks parallel algorithms parallel languages

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The /spl chi/-calculus

The /spl chi/-calculus

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proceedings of the advances in parallel and distributed computing

作者： Yuxi Fu Department of Computer Science Shanghai Jiaotong University Shanghai China

ISBN: (纸本)0818678763

The paper proposes a new process algebra, called /spl chi/-calculus. The language differs from /spl pi/-calculus in several aspects. First it takes a more uniform view on input and output. Second, the closed names of the language are homogeneous in the sense that there is only one kind of bound name. Thirdly, the effects of communications in /spl chi/-calculus are delimited by localization operators, not by sequentiality combinator. Finally, the language cherishes more freedom of parallelism than /spl pi/-calculus. The algebraic properties of /spl chi/-processes are studied in terms of local bisimulation. It is shown that local bisimilarity is a congruence equivalence on /spl chi/-processes.

关键词： Concurrent computing Calculus parallel processing Computational modeling Algebra

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distributed Real-time Systems : Issues, Solutions, And Applications

Distributed Real-time Systems : Issues, Solutions, And Appli...

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International conference on parallel and distributed Systems (ICPADS)

作者： Kang G. Shin University of Michigan USA

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On distributed snapshot algorithms

On distributed snapshot algorithms

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proceedings of the advances in parallel and distributed computing

作者： Letian He Yongqiang Sun Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai China

ISBN: (纸本)0818678763

Snapshot algorithms are fundamental for many distributed applications and must often be executed repeatedly. We present three snapshot algorithms. The first one is based on the assumption of global time, it computes channel states using several schemes. Taking consistent cut for global time instant, we show that the algorithm is applicable for existing snapshot algorithms. The second one is a real token passing based algorithm for non-FIFO asynchronous distributed systems. Its message complexity of control messages is O(n). The last algorithm is the repeated version of the second one. Using this algorithm, processes can get consistent global states at their convenience concurrently.

关键词： distributed computing Helium Sun Computer science Application software System recovery Control systems Control system synthesis Message passing Delay

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parallel matrix computations and their applications for biomagnetic fields

Parallel matrix computations and their applications for biom...

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proceedings of the advances in parallel and distributed computing

作者： V. Zerbe H. Keller G. Schorcht Faculty of Computer Science and Automation Technical University Ilmenau Germany

In this paper we present the results of a parallel implementation of a heart field simulation algorithm. The application of biomagnetic fields offers a wide range for using parallel algorithms. Pathological changes in the human body, especially in the heart muscle, can be diagnosed and localised by means of biomagnetic field parameters. The benefit of this diagnosis method is to fit an individual reference model of the heart field of a patient. Based on differences between the reference model and the real measured biomagnetic field parameters, the type and the position of defects in the heart can be located. The most time consuming components of the whole algorithm are the matrix computations, especially the matrix inversion. The matrix inversion can be implemented on a parallel distributed memory system. In this paper we discuss the routing, the parallel matrix inversion, and the speed up for different network topologies that depends on the number of processors and different problem sizes.

关键词： Computer applications Concurrent computing Biomagnetics Heart Biological system modeling Computational modeling parallel algorithms Pathology Humans Muscles

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An improved parallel algorithm for Delaunay triangulation on distributed memory parallel computers

An improved parallel algorithm for Delaunay triangulation on...

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proceedings of the advances in parallel and distributed computing

作者： Sangyoon Lee Chan-Ik Park Chan-Mo Park Department of Computer Science and Engineering PRL POSTECH Pohang South Korea

ISBN: (纸本)0818678763

Delaunay triangulation has been much used in such applications as volume rendering, shape representation, terrain modeling and so on. The main disadvantage of Delaunay triangulation is large computation time required to obtain the triangulation on an input points set. This time can be reduced by using more than one processor, and several parallel algorithms for Delaunay triangulation have been proposed. In this paper, we propose an improved parallel algorithm for Delaunay triangulation, which partitions the bounding convex region of the input points set into a number of regions by using Delaunay edges and generates Delaunay triangles in each region by applying an incremental construction approach. Partitioning by Delaunay edges makes it possible to eliminate merging step required for integrating subresults. It is shown from the experiments that the proposed algorithm has good load balance and is more efficient than Cignoni et al.'s algorithm (1993) and our previous algorithm (1996).

关键词： parallel algorithms Concurrent computing distributed computing Partitioning algorithms parallel processing Shape Merging Solid modeling Computer science Rain

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2nd International conference on Coordination Languages and Models, COORDINATION 1997

2nd International Conference on Coordination Languages and M...

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2nd International conference on Coordination Models and Languages, COORDINATION 1997

ISBN: (纸本)3540633839

The proceedings contain 31 papers. The special focus in this conference is on Coordination Languages and Models. The topics include: Exposing the skeleton in the coordination closet;design for open systems in java;checking assumptions in component dynamics at the architectural level;security benefits from software architecture;regulated coordination in open distributed systems;debugging distributed applications using a coordination architecture;coordinating durative actions;communication-passing style for coordination languages;software architecture for large control systems;evaluation of software architectures for a control system;modeling railway control systems using graph grammars;formal description of linda as a reactive system;three semantics of the output operation for generative communication;coordinating mobile agents via blackboards and access rights;modeling coordination via asynchronous communication;partial order and SOS semantics for linear constraint programs;programmable coordination media;coordinating actions systems;approximating unity;mobile unity coordination constructs applied to packet forwarding for mobile hosts;object-oriented protocol refinement in kannel;an asynchronous model of locality, failure, and process mobility;a component calculus for modeling the olan configuration language;a coordination model for distributed object systems;coordination patterns for parallel computing;concurrent MetateM as a coordination language and control-based coordination of human and other activities in cooperative information systems.

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